Projectile.



PA' IENTED NOV. 28, 1905.

E. M. JOHNSON. PROJEGTILE. APPLICATION FILED rn1s.1s,1so5.

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UNITED STATES PATENT OFFICE.

ELIAS M. JOHNSON, OF NEW YORK, N. Y., ASSIGNOR TO ISAAC Gr. JOHN- SONAND COMPANY, OF NEW YORK, N. Y.

PROJECTILE.

Specification of Letters Patent.

Patented Nov. 28, 1905.

Application filed February 15, 1905. Serial No. 245,764.

To all whom it may concern:

Be it known that I, ELIAS M. JOHNSON, a citizen of the United States,residing at New York, in the countyof New York and State of New York,have invented new and useful Improvements in Projectiles, of which thefollowing is a specification.

This invention has relation to projectiles provided with copper bandswhich operate as a kind of packing to prevent the gas from escaping bythe projectile in the act of firingthat is, when the powder is ignited.

It is the object of the invention to provide such improvements in theseat or score for the band as will render it certain that the band willnot turn' in the act of firing, and so prevent the mischief mentionedfrom occurring.

The invention is fully set forth in the following specification,reference being had to the annexed drawings and letters of referencemarked thereon, forming a part of the said specification, of which-Figure 1 is a view in elevation of a projectile provided with a copperband. Fig. 2 is a similar view, but representing the band removed andshowing the band score or seat for the band as provided with myimprovements. Fig. 3 is a perspective view of a band removed from theprojectile. Fig. 4 is a cross section taken on a supposed line runningthrough the band-seat and showing how my improvements may be effected.

It is well known that in firing shells, shot, or other projectilesprovided with copper bands, as before stated, the band is liable tobecome loose or slip, so that in its rotary motion after leaving the gunthe projectile is caused to tumble and fail to go forward in a straightline. To prevent this, it has been proposed to score the band-seat bymeans of a chisel, making cuts or nicks across the seat, and to allowthe copper to be pressed into these nicks, and various other means havebeen proposed for engaging the band to keep it from turning; but thedifficulty of doing this renders it uncertain of performing the workperfectly, and if it is not done perfectly and the copper band is notperfectly tight before the projectile is fired the rotary motion givento the projectile by the rifled bore in the gun is retarded, with theresultant mischief already set forth. By my improvements the said defector mischief is remedied, the

said improvements consisting in swaging up from the seat a, formed inthe projectile A, a number of fins o, surrounding holes 0, made byforming the fins. Owing to the nicks being small, isolated from eachother, and necessarily having edges more or less ragged and sharp, theybite into and hold the copperband with greater security than would bethe case were there employed straight cuts across the score or knurledsurface composed of isolated raised, and depressed surfaces.

In Fig. 4 I have shown a way in which my improvements may be carriedinto effect and also indicating the character of said improvements. Asuitably-constructed swage or punch (not shown) having a rounded orother properly shaped point will be set upon the band seat a andinclined in the direction in which it is supposed that the projectile Awill have a tendency to turn by reason of the rifiing of the gun, whichdirection is indicated by the arrow 2. By a stroke from a hammer orother tool upon the swage the latter will be driven into the metal andturns out a fin 6 around the depression or hole 0 thus formed, so thatby a slight turn or tendency of the band to turn the fin will cut intothe copper, filling the hole or depression 0 in front of it andfastening the band most securely and with certainty in its groove.

I claim- 1. A projectile provided with a band groove or score having theseat for the band constructed with numerous small holes or depressionsswaged therein, and fins formed from the displaced metal surrounding thesaid depressions or holes.

2. The combination, of a band, witha projectile provided with a score,to receive the band, the seat for the band in said score having numerousfins swaged up from the metal;

ELIAS M. JOHNSON.

Witnesses:

ANNIE NIEBRUGGE, J. J. MCKELVEY.

